Strong silicon oxide inclusions in iron

Slagter, Alejandra; Everaerts, Joris; Deillon, Léa; Mortensen, Alicja

doi:10.1016/j.actamat.2022.118437

Cited by 9 publications

(1 citation statement)

References 43 publications

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“…For the second system, roughly spherical silica inclusions 2 to 5 μm in diameter embedded in iron were tested (details of how the sample was fabricated can be found in the Methods section and in [ 19 ]). The nanoindentation results for those silica inclusions were compared to indentations performed on a fused silica reference sample used for calibration of the tip area function, assumed to come close to (but not necessarily to equal, given the density-dependence of silica glass properties) the silica making the inclusions.…”

Section: Discussion and Experimental Implementationmentioning

confidence: 99%

Nanoindentation of embedded particles

Slagter

Everaerts

Mortensen

2023

Journal of Materials Research

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We address the effect of elastic inhomogeneity on elastic modulus and hardness determinations made by depth-sensing indentations performed on individual particles embedded within a matrix of different elastic modulus. Finite element simulations and nanoindentation experiments are used to quantify the consequences of particle/matrix elastic inhomogeneity and we propose an adaptation of the Oliver–Pharr method that gives access to particle properties knowing those of the matrix. The method is suitable for any combination of matrix and particle elastic modulus and for any type of indenter, provided that the area of the tested particles along the surface of the sample is measured and that a large number of particles are probed. Further conditions for the implementation of the method are that testing conditions be such (i) that permanent deformation of the matrix is avoided, and (ii) that permanent deformation in each probed particle under the indenter is not affected by the matrix. Graphical abstract

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Section: Discussion and Experimental Implementationmentioning

confidence: 99%

Nanoindentation of embedded particles

Slagter

Everaerts

Mortensen

2023

Journal of Materials Research

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Nanoindentation Hardness and Modulus of Al2O3–SiO2–CaO and MnO–SiO2–FeO Inclusions in Iron

Slagter,

Setyadji,

Vogt

et al. 2024

Metall Mater Trans A

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Oxide inclusions appear in steel as a subproduct of steelmaking. These are generally detrimental to alloy properties; however, variations exist in the extent to which different inclusions are harmful because their properties vary as a function of their chemical composition. We use nanoindentation to measure the local elastic modulus and hardness of individual oxide particles, produced by precipitation within liquid iron, that belong to the systems Al2O3–SiO2–CaO and MnO–SiO2–FeO. Measured inclusion hardness values are typically in the range of 8 to 13 GPa and can reach 26 GPa for alumina-rich inclusions. Calcium aluminates rich in alumina are significantly stiffer than iron, with elastic moduli that can reach 350 GPa. On the contrary, calcium aluminates that are expected as a result of successful calcium treatment (i.e., with less than about 80 wt pct Al2O3 content) have elastic moduli below that of iron. This is also the case for the wide range of calcium aluminosilicates and of manganese silicates studied here. In addition, silicates containing about 70 to 80 wt pct MnO are observed to have a fine multiphase structure and an elastic modulus of ≈ 180 GPa. Those inclusions thus emerge as possible candidates if one aims to minimise, in loaded steel, stress concentrations associated with matrix-inclusion elastic mismatch.

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